<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script>
			
			var x = 10;
			console.log(x);
			
			{
				var x = 100;
				console.log(x);
			}
			
			console.log(x);
			
			let y = 10;
			console.log(y);
			
			{
				let y =100;
				console.log(y);
			}
			
			console.log(y);
			
			var sysname = "学生管理系统";
			console.log(sysname);
			sysname="mis;"
			console.log(sysname);
			
			var Π = 3.14;
			console.log(Π);
			Π = 3.1415926;
			console.log(Π);
			
			
			
			
		</script>
	</head>
	<body>
	</body>
</html>
